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数学 高校生

(3)が問題の意味から分かりません🥺 教えてください🙇🏻‍♀️🙇🏻‍♀️

文字aとbをいくつか並べた列のうちで, bが隣り合わないものだけを考える。 重要例題17nの式で表される順列 (2) 長さ5の列で, aで始まる列は何通りあるか。また, 長さ5の列で, bで始ま。 O0000 文字がn個並んだものを「長さnの列」 と呼ぶとき (1) 長さ 3の列, 長さ 4の列はそれぞれ何通りあるか。 る列は何通りあるか。 (3) 長さ nの列の個数をf(n) とするとき, f(n+2)=f(n+1)+f(n)がけh つことを示せ。 (津田整大 本 指針>(1) 辞書式配列法 を利用し, 条件を満たす列を書き上げる。 (2) 辞書式配列法の利用も列が長くなると大変。そこで(3) との関連もあり, (1)の長さ の列と長さ4の列を利用することを考える。 (1), (2) [, (3)] の問題 解法をまねる ことも有効。(2)と同じようにして, nの場合 (一般の場合)を考える。 ba を追加 f(n) aを追加 解答 (辞書式配列で、条件に運す るものを書き上げる。 (1) 長さ3の列は aaa, aab, aba, baa, bab したがって 5通り 長さ4の列はaaaa, aaab, aaba, abaa, abab, 6が連続するものを除く baaa, baab, baba したがって、 8通り 『aで始まる列は、, aの状 文字は4,6どちらでも (2) aで始まる長さ5の列は, 長さ4の列の前にaを付ければ よいから,(1) より また, bで始まる長さ5の列は,長さ3の列の前に baを付 ければよいから, (1)より (3) 長さ(n+2)の列のうち, aで始まる列は, 長さ (n+1)の列の前にaを付けたもの, 6で始まる列は, 長さnの列の前に baを付けたもの である。 8通り い。 るで始まる列は、bの次 5通り 文字はa。 (2)の一般化。 したがって f(n+2)=f(n+1)+f(n) 和の法則

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英語 高校生

教えて貰えませんか?

9 The Magic of Music 音楽の不思議なカ The history of music is very old. People alt over the world have always loved t, Is there anyone who doesn't like music? Probably the answer is no. Music is the most necessary things in life, Maybe people can't live without music. Do antmas and plants like music, too? Do they understand music? 2 One day Mrs. Evans read a very interesting story in the newspaper. A ** university professor found out that her plants became stronger when music was played for them. At first she thought that ., it was a joke, but she wanted to ury it herself. She built two rooms in the garden and put the same kind of vegetables in both rooms, The temperature of the rooms was the same and both of them were very 10 quiet. Music was played in one room. The other room was silent. Surprised to find that the next day the vegetables that she played music for became 1 E 1) She was 3) taller than the ones in the silent room. 3 In the United States, there was a farmer who kept many c0ws. The farmer was very interested in music, When he stayed at home, he always listened to music on the radio. One day he took his radio to the farm. When he was *milking his the radio was playing beautiful music. He found that the cows gave more milk "han the reason, and three months later he 15 COWS。 usual on that day, He wanted to know 4) learned that he could get more milk when the cows listened to beautiful, quiet musi。 4 Today many scientists say that animals and plants also enjoy music. Like ne 20 animals and plants need beautifu! music, But they don't like big, **terrible noises Scientists **complain about noise *"pollution. It damages animals, plants, and people They say that we must think about many kinds of noises that we are making every 5) 313 words) day.

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英語 高校生

合っているか見て頂きたいです! あと12.13の訳が分からないので教えてください🙇‍♀️

EXERCISE A >> 空所に入れるのに最も適切なものを選びなさい。 口01 The baby is sleeping. So, you ( 4)be so noisy. O had better not 2 had better not to 3 had not better の had not better to (中部大) 口02 I( 2 )not to tell my father/the true state of his health. 訳 O must 2 should better O ought (明海大) 口03 James has just had dinner. He ( ) be hungry already. O can't 2may must の mustn't (玉川大) 口04 He ( 4 ) be in because I can hear his radio. O shall 2 must have 3 has must (上智大) (1れども、…にもゃと6うが 口05 Maria ( 4 ) not give up smoking, though I told her to many times. O must 2 need の should の would 〈跡見学園女子大) 口06 My sister ( 2.)in Chicago, but she moved to Los Angeles last year. O is used to live 2 used to live 3 used to living のwas used to be living (明治大) Sused to be 口07 “What's that song youre listening to?" 3 )t before!” “You don't know? It's Yesterday' by the Beatles. You ( の hadn't heard 2might hear の shouldn't hear 3must've heard くセンター試験) 口08 “I saw Mr. Yamada at Shinjuku Station this morning.” “You( 2 )have. He's still on vacation in Hawaii” 2 didn't O couldn't might の should 〈センター試験) 3 ) to me when I warned you. be listening 口09 You should ( O be listened 3 have listened の listen くセンター試験) 口10 I couldn't ( 2 ) worrying about her health because she looked pale. (花園大 O take の help 3 make の let 口11 I( 4 )rather go to the movie theater than stay home. の might 3will のwould (金城学院大 O may

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